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DR. HIRAM GREAT DIAZ DIAZ CRNA
NPI 1821600420
Nurse Anesthetist, Certified Registered in Anaheim, CA

Active since August 17, 2020Accepts Medicare Assignment
7916 E WOODSBORO AVE, ANAHEIM, CA 92807(949) 257-5734 Get Directions Write a Review

NPPES record last updated: September 20, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Hiram Great Diaz Diaz Crna NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. HIRAM GREAT DIAZ DIAZ CRNA (NPI 1821600420) is an individual nurse anesthetist, certified registered in Anaheim, California, licensed in California (95002190) and active in the NPI registry since August 2020. He is a graduate of Other (2023).

NPPES Registry Identity

NPI1821600420
Entity TypeIndividualMale
Primary Taxonomy367500000X
Provider Legal NameDR. HIRAM GREAT DIAZ DIAZCredential: CRNA
Location Address7916 E WOODSBORO AVEAnaheim, CA 92807-2435
Mailing Address7916 E Woodsboro AveAnaheim, CA 92807-2435 · (949) 257-5734
Phone(949) 257-5734
Sole ProprietorYes
Medical School CMSOtherGraduated 2023
Enumeration DateAugust 17, 2020
Last NPPES UpdateSeptember 20, 2023
NPPES CertifiedSeptember 20, 2023
✔ NPI 1821600420 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Anesthetist, Certified RegisteredPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code367500000X
License✔ Licensed in CA · 95002190
Definition
(1) A licensed registered nurse with advanced specialty education in anesthesia who, in collaboration with appropriate health care professionals, provides preoperative, intraoperative, and postoperative care to patients and assists in management and resuscitation of critical patients in intensive care, coronary care, and emergency situations. Nurse anesthetists are certified following successful completion of credentials and state licensure review and a national examination directed by the Council on Certification of Nurse Anesthetists. (2) A registered nurse who is qualified by special training to administer anesthesia in collaboration with a physician or dentist and who can assist in the care of patients who are in critical condition.
Also ListedRegistered Nurse · Critical Care MedicineTaxonomy 163WC0200X · License 95066307 (CA)
7916 E WOODSBORO AVE, Anaheim, CA 92807
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Hiram Great Diaz Diaz Crna is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID749638625
PECOS Enrollment IDI20231204000903

Medicare Billing Reassignments

4

Medicare enrollment records show Hiram Diaz Diaz reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Orange Coast Anesthesia Inc
6.9 mi
Anesthesiology
2601 E CHAPMAN AVE
Orange, CA 92869
  • Reassigned Medicare billing, California enrollment
  • 168 clinicians in this Medicare group
NPI 1508138256 (714) 633-0011
Anesthesia Associates Of Southern California PC
9.1 mi
Anesthesiology
1001 N TUSTIN AVE
Santa Ana, CA 92705
  • Reassigned Medicare billing, California enrollment
  • 31 clinicians in this Medicare group
NPI 1437013836 (914) 491-9495
Darin Rentz Do PC
34 mi
Anesthesiology
350 TERRACINA BLVD
Redlands, CA 92373
  • Reassigned Medicare billing, California enrollment
  • 241 clinicians in this Medicare group
NPI 1689321747 (877) 565-6701
Coachella Valley Anesthesia A Professional Corporation
126 mi
Anesthesiology
420 34TH ST
Bakersfield, CA 93301
  • Reassigned Medicare billing, California enrollment
  • 183 clinicians in this Medicare group
NPI 1013662048 (760) 538-5898

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Anesthesia for total hip replacement 01214
Anesthesia for total hip replacement is a medical service where medication is given to eliminate pain during surgery. Two types are commonly used: general anesthesia, making you unconscious, or spinal anesthesia, numbing the lower body. The choice depends on your health and your doctor's recommendation.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92807 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Hiram Diaz Diaz's NPI number?

The NPI number for Hiram Diaz Diaz is 1821600420. It was assigned to this individual provider in the NPPES registry on August 17, 2020.

Where is Hiram Diaz Diaz located?

Hiram Diaz Diaz practices at 7916 E Woodsboro Ave, Anaheim, CA 92807. The listed phone number is (949) 257-5734.

What is Hiram Diaz Diaz's specialty?

The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.

Is Hiram Diaz Diaz enrolled in Medicare?

Yes. Hiram Diaz Diaz is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Hiram Diaz Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hiram Diaz Diaz reassigns Medicare benefits to 4 organizations: Orange Coast Anesthesia Inc (Orange, CA), Anesthesia Associates Of Southern California PC (Santa Ana, CA), Darin Rentz Do PC (Redlands, CA) and Coachella Valley Anesthesia A Professional Corporation (Bakersfield, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Hiram Diaz Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Hiram Diaz Diaz was last updated on September 20, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.